Last week, amid the media furor over the "polar vortex," the White House did something pretty unusual. It released a highly produced scientific video titled "The Polar Vortex Explained in 2 Minutes."

In the video, White House science adviser and physicist John Holdren dismantles silly claims that cold weather refutes global warming. "The fact is that no single weather episode can either prove or disprove global climate change," explains Holdren. He then describes how, in fact, climate change could make extreme winter weather in the mid-latitudes more common. "A growing body of evidence suggests that the kind of extreme cold being experienced by much of the United States as we speak is a pattern that we can expect to see with increasing frequency as global warming continues," Holdren asserts.